Rear in iPhone 5
Some people has said the back side of the iPhone doesn't looks very Apple, but... I think I can imagine the reason behind that change, and no, don't thing that like somebody said it could be plastic at the center and glass at the bottom and top. My guess is it's the same material, just it's soft at the top and the bottom and texturized at the center, why this? for those who have an iPhone 4S... when you get your hand into the pocket... can you tell what side is each one, like you could do with the iPhone 3GS an all the older models? because these where different from each side, so just by touching it you could knew what side is the front, but with the 4 and 4S - I've got the last one - ... It's hard to tell! you have to touch the menu button to know it, or wait to take it out of the pocket and see the phone to know it. And precisely when I was looking for a screen protector I found one that had two parts: one for the front and one for the rear. Of course: the front part is totally flat, but the rear cover... ¡is translucent but texturized! And it turned out to be an excellent tool for me to just by touching the phone know what side is the front! My guess is that this is the reason for the appearance of the rear we see in this part.
Now, for the headphone minijack... has anybody considered that this characteristic: to have it on the bottom is typical from the iPod Touch??... What if this we've been thinking is the iPhone's update, but in fact is the new iPod Touch?? After all it's been much more time since the last update for the iPod Touch. And yes, this may probably be the appearance of the new iPhone 5, but may be the iPod Touch will come to light on this days with this new design and new screen size and that's the part we see here, and the iPhone will come with the same kind of case but in a few more weeks or months!
That's my guess...